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    Ann N Y Acad Sci. 2004 Dec;1035:49-67.

    BACE1 gene expression and protein degradation.

    Zhou W, Qing H, Tong Y, Song W.

    Source

    Department of Psychiatry, Brain Research Center, University of British Columbia, Vancouver, Canada. weihong@interchange.ubc.ca

    Abstract

    Deposition of amyloid beta protein in the brain is the major pathological feature of Alzheimer's disease. Amyloid beta protein is generated from beta-amyloid precursor protein by beta-secretase and gamma-secretase. Proteolytic processing of amyloid precursor protein at the beta site by BACE1 is essential to generate amyloid beta protein. BACE1, the major beta-secretase involved in cleaving amyloid precursor protein, has been identified as a type 1 membrane-associated aspartyl protease. In this study, we found that BACE1 gene expression is controlled by a TATA-less promoter. BACE1 gene expression is tightly regulated at the transcriptional level and the transcription factor Sp1 plays an important role in regulation of BACE1 to process amyloid precursor protein generating amyloid beta protein. Furthermore, we found that BACE1 protein is ubiquitinated, and the degradation of BACE1 proteins and amyloid precursor protein processing are regulated by the ubiquitin-proteasome pathway.

    PMID:
    15681800
    [PubMed - indexed for MEDLINE]

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